linux-kernel - [RFC PATCH HBK: 0/8] HW BOUND KEY as TRUSTED KEY

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Date:   Mon,  5 Sep 2022 20:06:23 +0530
From:   Pankaj Gupta <pankaj.gupta@....com>
To:     gaurav.jain@....com, sahil.malhotra@....com,
        kshitiz.varshney@....com, horia.geanta@....com,
        linux-kernel@...r.kernel.org, V.Sethi@....com
Cc:     Pankaj Gupta <pankaj.gupta@....com>
Subject: [RFC PATCH HBK: 0/8] HW BOUND KEY as TRUSTED KEY

Hardware Bound key(HBK), is never acessible as plain key outside of the
hardware boundary. Thus, it is un-usable, even if somehow fetched
from kernel memory. It ensures run-time security.

This patchset adds generic support for classing the Hardware Bound Key,
based on:

- Newly added flag-'is_hbk', added to the tfm.

  Consumer of the kernel crypto api, after allocating
  the transformation, sets this flag based on the basis
  of the type of key consumer has.

- This helps to influence the core processing logic
  for the encapsulated algorithm.

- This flag is set by the consumer after allocating
  the tfm and before calling the function crypto_xxx_setkey().

First implementation is based on CAAM.

NXP built CAAM IP is the Cryptographic Acceleration and Assurance Module.
This is contain by the i.MX and QorIQ SoCs by NXP.

CAAM is a suitable backend (source) for kernel trusted keys.
This backend source can be used for run-time security as well
by generating the hardware bound key.

Along with plain key, the CAAM generates black key. A black key is an
encrypted key, which can only be decrypted inside CAAM. Hence, CAAM's
black key can only be used by CAAM. Thus it is declared as a hardware bound key.

Pankaj Gupta (8):
  keys-trusted: new cmd line option added
  hw-bound-key: flag-is_hbk added to the tfm
  sk_cipher: checking for hw bound operation
  keys-trusted: re-factored caam based trusted key
  caam blob-gen: moving blob_priv to caam_drv_private
  KEYS: trusted: caam based black key
  caam alg: symmetric key ciphers are updated
  dm-crypt: consumer-app setting the flag-is_hbk

 crypto/skcipher.c                         |   3 +-
 drivers/crypto/caam/blob_gen.c            | 242 ++++++++++++++++++++--
 drivers/crypto/caam/caamalg.c             |  37 +++-
 drivers/crypto/caam/caamalg_desc.c        |   8 +-
 drivers/crypto/caam/desc.h                |   8 +-
 drivers/crypto/caam/desc_constr.h         |   6 +-
 drivers/crypto/caam/intern.h              |   6 +-
 drivers/md/dm-crypt.c                     |   6 +-
 include/keys/trusted-type.h               |   2 +
 include/linux/crypto.h                    |   2 +
 include/soc/fsl/caam-blob.h               |  44 ++--
 security/keys/trusted-keys/trusted_caam.c |   6 +
 security/keys/trusted-keys/trusted_core.c |  14 ++
 13 files changed, 333 insertions(+), 51 deletions(-)

-- 
2.17.1